Fire-box.



J. HASSEL-IENSEN. FIRE BOX.

APPLICATION FILED IIIAYsI. |916.

. 'Patented sept. 25,1917.

JOHANNES KASSEL-JENSEN, OF COIENI-IAGEN, DENMARK.

Finn-B0X.

raaoeri.

Specification of Letters `Elatent.v

Application iled'May 31, 1916. Serial No. 100,920.

To vall whom t may concern:

Be it known that I, JOHANNES Hassan-JEN- SEN, engineer, a citizen of the Kingdom of Denmark, residing at Copenhagen, in the Kingdom of Denmark, and whosepost-ofhce address is No. 24 Sommerstedgade, Copenhagen, Denmark,'have invented certain new and useful Improvements in Fire-Boxes; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the Aart to which it appertains to make and use the same, reference being had to the accompanying drawings, and to letters or figures of reference marked thereon, which form a part of this specification.

This invention refers to secondary air supply in lire-places, especially in boiler fireboxes, and its object is to get secondary air of comparatively high temperature distributed in such a manner in the smoke behind the lire-bridge, or the like, that perfectly combusting flames are produced there. In order to accomplish this, the mouthpiece through which the secondary air is supplied, and which is disposed behind the fire-bridge, or the like comprises a plurality of members which, not only have a large surface for the smoke to act upon, so that the air, on passing over them, is thoroughly preheated, but also have such a shape and such outlet openings that the smoke passes among them in the form of many currents encircling one another, while also the directions of the issuing air-jets everywhere cross one another, causing thesmoke in the zone behind the openings to whirl together in intimate contact with the hot secondary air. As experiments have proved, 'this makes it possible to maintain a lively and perfectly combusting flame in said Zone, whereby a greatly increased economy in firing is obtained, and formation of soot is prevented.

The shape of the members in question will be best understood if we liken them to fiattened trumpets, each with a long and narrow mouth and is also corrugated in such a manner that the long and narrow outlet opening does not run in a straight line but in a zigzag line, an undulating line, or the like.

The drawing` illustrates one mode of construction, by way 0f example. Figure 1 is a longitudinal section (along the line Af-A in Fig. 2) through a furnace with 'a' secondary air mouthpiece of the kind here set forth. l

Fig.\2 shows the mouthpiece seen from behind'.l

Figs. 3 and l are sections through a mouthpiece Amember alongthe line B--B in Fig. l and the line C-C in Fig. 2 respectively.

Each of the members a- (z'. c. four in all) runs from the center backward in an undulating shape, the result of which is that obliquely running intervening spaces L for the passage of the smoke occur between the members, first on the one side and then on the other, and also that the members themselves at their rear are given corresponding undulating outlet openings p for the secondary air. The lower edges s of the members a'. lit into openings formed in a frame o, while flanges o, formed on the members above their lower edges, rest on said frame. lOn the front part of the flanges o there are hook-lugs n which mesh into corresponding recesses in a flange on the frame o. The latter can be secured by means of bolts to the plates Z and c belonging to the fire-box construction. An oscillating damper ,'F, which serves to regulate the supply of secondary air, can be turned from the outside by means of a traction-rod Z, whose handle t is furnished with notches, so that the damper can be adjusted in the desired position. 'm is the usual masonry bridge, e is the grate supporter, and r is the grate.

The construction here shown can easily be installed in boilers, or the like, which are already in use. In other respects the details shown in the drawing and set forth inthe specification are immaterial to the invention and may be altered in many ways.

I claim 1. A mouth-piece for secondary air supply in vfire boxes, comprising a flattened trumpet-shaped member corrugated in cross section forming air passages adapted to direct air issuing from the outlet end in paths crossing one another.

2. A mouthpiece for secondary air supply in fire boxes, comprising a plurality of flattened trumpet-shaped members corrugated in cross section forming air passages adapted to direct air issuing from the outlet end Patented sept. a5, i917.

.corrugated in cross section forming air passages adapted to direct air issuing from `the outlet end of each in paths crossing one another and spaced apart to`form sinuous smoke passages communicating With 'said lire-box, and means to supply air Yto said v members.

4. In a furnace, means for supplying secondary air thereto consisting of a plurality Copies of this lpatentvmay be obtained -for of flattened trumpet-shaped members corrugatedin cross section and placed across the path of the smoke and products of comb-ustion, said members forming between them sinuous smoke passages,and means for supplying air to said members whereby alternating currents of air and smoke cross one another.`

'In testimony that I claim the foregomg presence of two subscribing Witnesses.

JOHANNES HASSEL-J'ENSEN.

Vitnesses:

' P. HOFMAN-IBAANG, ERNEST ROUTARD.

ve c ents each, lary-addressing the Commissioner ,of Patents, VVlashington, D.

y25 as my invention, I have signed my name in 

